Considered one of the most beautiful buildings in northern Italy, construction of the Duomo began at the end of the 14th century and was completed only in the mid-18th century with the addition of the Baroque-style dome, designed by Filippo Juvarra.

The church is built of white marble, and its façade blends various architectural styles:

A Romanesque-style entrance door (remnant of the previous church that stood on the site)

A rose window

Gothic spires

Renaissance side doors

The interior is designed in Gothic style, divided into three naves separated by ten columns, and features dozens of masterpieces, including:

Paintings

Tapestries from Florence, Ferrara, and Antwerp

Frescoes in the apse depicting Saint Ambrose, the patron saint of the city.